CET Chemistry 2012
1.
2.
3.
4.
Aim & Scope of Organic Chemistry
Composition of Organic compounds
Classification of Organic compounds
Polymers
1. Which one of the following drug reduces fever?
1) Analgesics
2) Tranquilizers
3) Antipyretics
4) Antibiotics
Ans: 3) Antipyretics
Analgesics are drugs used to relieve the pain. Tranquillizers are drugs used
for treatment of mental disorder & stress
Antibiotics are drugs obtained from micro -organisms used to kill some other
disease causing micro organism
2. Which of the following could act as a propellant for rockets
1) Liquid nitrogen + liquid oxygen
2) Liquid Hydrogen + liquid nitrogen
3) Liquid oxygen + liquid argon
4) Liquid Hydrogen + liquid oxygen
Ans:4) Liquid Hydrogen + liquid oxygen
The fuels used for launching rockets are known as propellants
In general rocket propellants consists of a fuel & oxidizers.
Liquid H2 is a fuel with low mol. mass & high heat of combustion. O2 is a
supporter of combustion
3. Which on is a broad spectrum drug?
1) Chloramphenicol
2) Chloroquine
3) Chloroxylenol
4) Plasmoquine
Ans: 1) Chloramphenicol
The antibiotics are used to kill many micro-organisms and effective against
many diseases are called broad spectrum drugs. Chloramphenicol is a
antibiotic.
Chloroquine & Plasmoquine are antimalarials
Chloroxylenol is a antiseptics
4)The explosive RDX is obtained by
1) Nitration of Toluene
2) Nitration of Phenol
3) Nitration of urotropine
4) Nitration of cellulose
Ans: 3) Nitration of urotropine
Nitration of urotropine gives RDX or cyclonite
Nitration of toluene gives TNT
Nitration of phenol gives picric acid
Nitration of cellulose gives gun cotton
5. Empirical formula of the compound is CH2O. Its molecular mass is 180. Then
the molecular formula will be.
1) C6H12O6
2) C5H10O5
3) C3H6O3
4) C4H8O4
Ans: 1) C6H12O6
Molecular formula =(empirical formula)n
Empirical formula mass = 12+2+16 =30
n= Molecular formula mass = 180 = 6
Empirical formula mass
30
Molecular formula = (CH2O)6 =C6H12O6
6. In Kjeldahl’s method ammonia from 5gm of food neutralizes 30cm3 of 0.1N
acid. The percentage of nitrogen in the food is.
1) 8.4
2) 0.84
3) 1.68
4) 16.8
Ans: 2)0.84
% of N =1.4(NV)acid used for neutralization
Mass of organic compound
=1.4 x 0.1 x30 = 0.84
5
7. The compound which dose not gives Prussian blue colour in the Lassaigne’s
test for nitrogen is.
1) Aniline
2) Glycine
3) Urea
4) Hydrazine
Ans: 4) Hydrazine
All the compounds contain nitrogen. But hydrazine (NH2-NH2) does not contain
carbon required for the formation of NaCN
8. 0.15 gram of hydrocarbon on complete combustion gives 0.44 gram of CO2 .
The % of carbon & hydrogen is
1) 80 & 20
2) 40 & 60
3) 90 & 10
4) 70 & 30
Ans: 4) 80 & 20
Hydrocarbons contains only C &H
% of C= 12 x
44
mass of CO2
mass of compound
= 12 x 0.44 x 100
44
x 100
= 80
0.15
Therefore % hydrogen = 20
9.
An organic compound contains 40% Carbon, 6.7% hydrogen and rest
oxygen. The empirical formula of the compound is.
1) C2H2O
2) CH2O2
3) CH2O
4) CHO
Ans: 3) CH2O
10.
The functional group isomer of
CH3-CH2-CH2-OH is
1) CH3 -CH –CH3
OH
2) CH3 CO CH3
3) CH3- O- CH3
4) CH3- CH2-O -CH3
Ans: 4) CH3- CH2-O -CH3
Compounds having same molecular formula but contains different functional
group are called functional group isomers
Functional group isomer of alcohols is
ether which contains same number of carbon atoms
11. The maximum number of isomers for alkenes with a molecular formula
is
C4 H8
1) Two
2) Three
3) Four
4) Five
Ans: 3) Four
Alkenes with molecular formula C4H8 exhibits chain isomerism, position
isomerism & geometrical isomerism. The four isomers are 1-butene, 2-methylpropene,
cis-2-butene and
trans- 2-butene
12. Which one of the following shows functional isomerism?
1) C2H4
2) C3H6
3) C2H5OH
4) CH2Cl2
Ans: 3) C2H5OH
Functional group isomer of C2H5OH is
CH3-O-CH3. (functional group isomer of alcohol is ether).
Further Hydrocarbons & halo alkanes dose not exhibit functional group isomerism
13.
Compounds
CH3-O-C3H7 and
C2H5- O-C2H5 exhibit
1) Metamerism
2) Cis-trans isomerism
3) Chain isomerism
4) Position isomerism
Ans: 1) Metamerism
Compounds having same molecular formula but different distribution of alkyl groups
are called metamers. In this example distribution of alkyl groups around the functional
group –O- are different. In first isomer CH3&C3H7. In second isomer C2H5&C2H5
14.
Heterocyclic compound among the following is
1) Pyrrole
2) Benzene
3) Cyclopropane
4) Naphthalene
Ans: 1) Pyrrole
Heterocyclic compounds have ring structure in which one or more carbon atoms
of the ring is replaced by hetero atoms like O,N Or S. pyrrole is a heterocyclic
compound containing oxygen. Benzene & Naphthalene are aromatic compounds.
Cyclopropane is a cycloalkane.
15.
The IUPAC name of tert-butylchloride is
1) 4-chlorobutane
2) 2-Chlorobutane
3) 1-chloro-3-methylpropane
4) 2-chloro-2-methylpropane
Ans: 4) 2-chloro-2-methylpropane
Structure of tert-butylchloride is
CH3
1
CH3- C 2- CI
3
CH3
parent chain contains 3 C-atoms.it is a derivative of propane. Two substituent groups
–CH3&-Cl are on second carbon. Names of the groups are arranged alphabetically.
16.
The IUPAC name of (CH3)2 CH –CH2-CH2-Br is
1) 3,3-dimethyl-1-bromopropane
2) 2-methyl-2-bromobutane
3) 1-bromopentane
4) 1-bromo-3-methylbutane
Ans: 4) 1-bromo-3-methylbutane
The structure of the molecule is
4
3
2
1
CH3 - CH –CH2-CH2-Br
CH3
The parent chain contains 4 C-atoms. Chain is numbered from right hand side
(substituent group’s gets no.1&3). Further names of the two groups are arranged
alphabetically.
17.
The IUPAC name of CH2= C- CH -CH3
Cl CH3
1) 2-chloropent-1-ene
2) 2-methyl-3-chlorobut-3-ene
is
3) 3-methyl-2-chlorobut-1-ene
4) 2-chloro-3-methylbut-1-ene
Ans: 4) 2-chloro-3-methylbut-1-ene
1
2
3
4
CH2= C – CH- CH3
CI CH3
parent chain contains 4 carbon atoms. Numbering of carbon atoms is done from the
right which gives least number to the position of double bond. The two groups, chloro &
methyl are arranged alphabetically.
18. Which of the following IUPAC name is correct?
1) 2-Methyl-3-ethyl pentane
2) 2-Ethyl-3-methyl pentane
3) 3-Ethyl-2-methyl pentane
4) 3-Methyl-2-ethyl pentane
Ans: 3) 3-Ethyl-2-methyl pentane
Substituent groups are arranged alphabetically. Ethyl group should be named first. So
option 1&4 are wrong. In alkane ethyl group cannot be present on second carbon
atom. Option 2 also wrong. Option 3 is correct. Its structure is
CH3 CH2-CH3
CH3 – CH - CH- CH2-CH3
19. The IUPAC name of
H
C4H9
H3C- CH2 - C - C - CH3
CH3 CH3
1) 2-ethyl 3, 3-dimethylheptane
2) 2-butyl 2,3-dimethyl pentane
3) 2-ethyl-3,4,-dimethylheptane
4) 3,4,4-trimethyloctane
Ans: 4) 3,4,4-trimethyloctane
The structure of the molecule
5
6
7
8
CH2- CH2- CH2- CH3
1
2
3
4
H3C- CH2 – CH - C - CH3
CH3 CH3
parent chains contains 8 C-atoms. Carbon chain is numbered from left. 3 methyl
groups present at 3,4,4 position
20. The IUPAC name of
IS
1) 4,4-dimethyl-3-ethylheptane
2) 5-ethyl-4, 4-dimethylheptane
3) 3-ethyl-4,4-dimethylheptane
4) 1,1-diethyl-2, 2-dimethylpentane
Ans: 3) 3-ethyl-4,4-dimethylheptane
CH3. CH2-CH3
CH3-CH2 –CH2- C - CH-CH2-CH3
7
6
5
4
3
2
1
CH3
Longest continuous carbon chain contains 7 carbon atoms. The compound is
derivative of heptane. Carbon chain is numbered from the right. The substituent groups
get no 3,4&4. (From left no 4,5& 5 ) Groups are arranged alphabetically.
21. The IUPAC name for the compound
CH2=CH-CH2 -C≡CH is
1) Pent-1-en-4-yne
2) Pent-4-en-1-yne
3) Pent-2-en-4-yne
4) Pent-1-en-3-yne
Ans: 1) Pent-1-en-4-yne
1
2
3
4
5
CH2=CH-CH2 -C≡CH
If double& triple bonds are present in equidistance from both the end, then double
bond is preferred over triple bond. So carbon chain is numbered from right.
22. The IUPAC name of the compound
H3C-CH=CH- C≡CH is
1) Pent -2 -en-4-yne
2) Pent – 3- en-1-yne
3) Pent -3-en-5-yne
4) Pent -2,4 -en-2-yne
Ans: 2) Pent – 3- en-1-yne
If the triple bond is closer from one end than the double bond from other end then
triple bond is given the preference.
5
4
3
2
1
H3C – CH = CH – C ≡ CH
23. The IUPAC name of
CHO
Br
1) 2-methtyl-3-bromobutanal
2) 3-bromo-2-methylpentanal
3) 2-methyl-3-bromohexanal
4) 3-bromo-2-methylbutanal
Ans: 2)3-bromo-2-methylpentanal
The structure is
1
CHO
2
3
4
5
CH3 – CH – CH - CH2-CH3
Br
-CHO is the functional group. Parent chain contains 5 carbon atoms. Hence it is
pentanal. Names of –Br &-CH3 are prefixed alphabetically.
24. IUPAC name of the compound CH3-CH2-CH-CH2-COOH is
CHO
1) 3-ethyl-4-oxo-butanoic acid
2) 3-formylbutanoic acid
3) 3-pentan-3-al-1-oic acid
4) 3-formylpentanoic acid
Ans: 4) 3-formylpentanoic
On the basis of priority–COOH is principle functional group.& –CHO is substituent
group. Longest chain including principle function group contains 5 carbon atoms. Here
–CHO is not part of parent chain. Hence it is named as formyl.
5
4
3 2
1
CH3-CH2-CH-CH2-COOH
CHO
25. IUPAC name of the compound
CH3-CH-CH2-COOH
is
CHO
1 ) 3-formylbutanoic acid
2) 4-oxo-3-methylbutanoic acid
3) 3-formylpropanoic acid
4) butan-3-al-1-oic acid
Ans: 2) 4-oxo-3-methylbutanoic acid
Here–COOH is principle functional group. the substituent.–CHO group is part of parent
chain. Since carbon of –CHO group is already named in parent chain, the substituent
group is named as –oxo (not formyl)
3
2
1
CH3-CH-CH2-COOH
4CHO
26. IUPAC name of the compound is
OH C2H5
H3C - C - C - OH
CH3 H
1)
2)
3)
4)
4-methyl-1,2 –pentanediol
2-methyl-2,3-pentanediol
2-methyl-1,2 -hexanediol
1-ethyl-2-methyl-1,2-propanediol
Ans: 2) 2-methyl-2,3-pentanediol
the structure of the molecule is
4
1
5
OH CH2-CH3
2
3
CH3 - C – C – OH
CH3 H
Parent chain contains 5 C-atoms & 2 –OH
Groups. It is a pentanediol. Chain is numbered from left so functional group’s gets
minimum number
27. IUPAC name of the compound
HOOC-CH2-CH-CH2-COOH
COOH
1) 3-carboxy pentanoic acid
2) Propane-1,2,3-tricarboxylic acid
3) Hexane-1,3,5-trioic acid
4) Propan-1,2,3-tricarboxylic acid
Ans: 4) Propan -1,2,3- tricarboxylic acid
If an unbranched carbon chain is directly linked to more than two same functional
groups the organic compounds named as derivative of parent alkane which does not
include the carbon atoms of the functional groups.
28. What is the IUPAC name compound
CH3-CH- CHO
CH2 -CH3
is
1) Butan-2-aldehyde
2) 2-ethyl propanal
3) 2-methyl butanal
4) 2-methyl butanol
Ans: 3) 2-methyl butanal
The molecule contains aldehyde functional group. Parent chain contains 4 carbon
atoms. Carbon chain is numbered from the direction which gives the No. 1 for the CHO carbon atom.
2
1
CH3 – CH - CHO
CH2 - CH3
3
4
29
What is the IUPAC name of the compound CH2-CH-COOH
OH NH2
1) 1-hydroxy-2-amino-3-propanoic acid
2) 3-hydroxy-2-aminopropanoic acid
3) 2-amino-3-hydroxypropanoic acid
4) 1-amino-2-hydroxypropanoic acid
Ans: 3) 2-amino-3-hydroxypropanoic acid
3 2 1
CH2-CH-COOH
OH NH2
-COOH is principle functional group.-OH &-NH2 are substituent's. chain is numbered
from left so that –COOH carbon should get No. 1
30
The correct IUPAC name for the compound (CH3)3COH is:
1) Trimethylmethan -1-ol
2) 1,1,1-Trimethylmethan -1-ol
3) 1-Butanol
4) 2-Methylpropan-2-ol
Ans: 2-Methylpropan-2-ol
The structure of the molecules is
OH
1
2
3
CH3 - C - CH3
CH3
The parent chain contains three carbon atoms. The –OH functional group and –CH3
substituent groups are present on second carbon
31
The IUPAC name for the compound CH3- C- CH2-CHO
O
1) 3-Keto-1-butanal
2) 3-0xobutanal
3) 4-oxo-2-butanone
4) 4-formyl-2-butanone
is
Ans: 2) 3-0xobutanal
4
3
2
1
CH3- C- CH2-CHO
O
-CHO is principle functional group.>C=O group is substituent and its name is prefixed
as oxo. The chain is numbered from right so that -CHO carbon should get no.1
32
Gutlapercha, a thermoplastic is
1) A type of nylon sheet.
2) Synthetic rubber
3) An isomer of natural rubber
4) Thread of terylene
Ans: 3) An isomer of natural rubber
Isoprene is a monomer of both natural rubber & guttapurcha. Natural rubber is a
polymer of cis-isoprene. Guttapurcha is a polymer of trans-isoprene. Since it softens
on heating, it is a thermoplastic.
33
Zeigler-Natta catalyst is used in making
1) LDPE
2) HDPE
3) Polystyrene
4) Nylon-66
Ans: 2) HDPE
When ethene is heated to60-70oc at6-7 atm in the presence of Ziegler-Natta catalyst
(TiCl4+(C2H5)3Al in n- heptane) high density polyethene (HDPE) is formed.
34
The monomer of Buna-s rubber are
1) Styrene & butadiene
2) Isoprene & butadiene
3) Vinyl chloride & sulphur
4) Butadiene
Ans: 1) Styrene & butadiene
Buna-S is a synthetic rubber obtained by heating butadiene& styrene in presence of
sodium catalyst.
In Buna-S, Bu stands for butadiene. Na stands for sodium. S stands for styrene.
35
Which of the following is not a homopolymer?
1) Bakelite
2) Polyethylene
3) Teflon
4) PVC
Ans: 1) Bakelite
Homopolymer -polymers containing only one type of monomer. Polythene, Teflon &
PVC are homopolymers.
Copolymers-polymer containing more than one monomers. Bakelite is a polymer of 2
monomers formaldehyde & phenol
36
The condensation polymer among the following is
1) PVC
2) Polythene
3) Rubber
4) Protein
Ans: 4) Protein
Condensation polymer- formed by condensation of monomers with the elimination of
small molecules like H2O.NH3 etc. protein is formed by condensation of monomers αamino acids with the elimination of H2O
Addition polymers- formed by simple addition of monomers without elimination. Expolythene
37
In Lassaigne’s test thiourea is converted into
1) NaCN
2) Na2S
3) Na2SO4
4) NaCNS
Ans: 4) NaCNS
Thiourea contains both N&S. When it is heated with sodium metal it is converted in to
NaCNS
38
Which of the following are isomers
1) Propanone & Ethanol
2) Methylalcohal & Dimethyl ether
3) Propanoic acid & Acetone
4) Acetic acid & methyl formate
Ans: 4) Acetic acid & methyl formate
The following pairs have different functional groups. So only functional isomer is
possible. Propanone & ethanol are not isomeric(ketone& alcohol). Methyl alcohol&
dimethyl ether are alcohol & ether. They can be isomeric. But they have different
molecular formula. Propanoic acid & acetone not isomeric(carboxylic acid& ketone).
Acetic acid & methylformate are isomeric(carbxylic acid& formate ester).they have
same molecular formula.
39
The IUPAC name of
H3C-C=CH-CH-CH3 is
Cl
CH3
1) 2-Chloro-4-methyl-2-pentene
2) 4-Chloro-2-methyl-2-pentene
3) 4-methyl-2-chloro-2-pentene
4) 2-Chloro-4,4-dimethyl-2-butene
Ans: 2) 2 -methyl propanoic acid
Numbering of carbon atoms is done from the end which gives least number for the
position of the double bond. So numbering from right. The chain contains five Carbon
atoms. Hence it is 2-pentene. Further the Chloro & methyl groups present on C2 and C4
respectively. The names of two groups arranged alphabetically.
40
The correct decreasing order of priority for the functional groups of
organic compounds in the IUPAC system of nomenclature is
1) -CHO, -COOH, -COOR, -CONH2
2) -CONH2, -CHO, - COOR, -COOH
3) -COOH, - COOR, -CONH2, -CHO
4) -COOR, -COOH, -CONH2 -CHO
Ans: 3) -COOH, - COOR, -CONH2, -CHO
The order of priority is - COOH> -COOR >-COONH2 -CN>-CHO> -CO->-OH> -NH2>
C=C> C≡C
41
Household gaseous fuel (LPG) mainly contains
1) C2H2
2) CH4
3) C4H10
4) C2H4
Ans: 3) C4H10
Mainly contains butane
42
Paracetmol is a/an:
1) Analgesics
2) Antipyretics
3) Antimaterial
4) Both antipyretic and analgesic
Ans: 4) Both antipyretic and analgesic
1) Paracetamol and aspirin acts both antipyretic as well as antiseptic
43
During Lassaigns test for nitrogen using sodium fusion extract the
nitrogen of organic compound gets converted into blue colour.
1) Sodium nitride
2) Sodium cyanide
3) Sodium ferro cyanide
4) Ferric ferrocyanide
Ans: 4) Ferric ferrocyanide
Fe4[Fe(CN)6]3
ferric ferrocyanide(prussain blue colour)
44
In the Lassaigne’s test for sulphur in the organic compound with
sodium nitoprusside solution the purple color formed is due to
1) Na4[Fe(CN)5 NOS]
2) Na3(Fe(CN)5 ]
3) Na2[Fe(CN)5 NOS]
4) Na3[Fe(CN)6]
Ans: 1) Na4[Fe(CN)5 NOS]
Na2[Fe(CN)5 NO] +
Na2S
Na4[Fe(CN)5NOS]
sodium nitroprusside (from o.c)
45
purple colour
Natural rubber is made up of
1) Cis 1,2- isoprene units
2) Cis 1,3- isoprene units
3) Cis 1,4- isoprene units
4) Cis 1,5- isoprene units
Ans: 3)Cis 1,4- isoprene units
During polymerisation C1 and C4 atoms of cis isoprene units link to each other.
46
The alkane with molecular formula C7H14 exhibit
1) Chain isomerism
2) Optical isomerism
3) Position isomerism
4) Both chain & optical isomerism
Ans: 4) Both chain & optical isomerism
Alkane up to carbon atoms 4-6 exhibit only chain isomerism. Alkane with carbon atoms
7 onwards show both chain &optical isomerism. (3-methylhexane is contain one chiral
carbon& is optically active)
47
The IUPAC name of CH3 COOCH3 is
1) Ethyl methanote
2) Methyl acetate
3) Methyl methanote
4) Methyl ethanote
Ans: 4) Methyl ethanote
The compound is ester. IUPAC name of the ester is obtained from corresponding
carboxylic acid by replacing suffix - oic acid by –ate and the alkyl group bonded to
oxygen atom name is added as a prefix.
In this example carboxylic acid is ethanoic acid& alkyl group is methyl
48
CH3
The IUPAC name of
H- C - COOH is
CH3
1) Iso butryic acid
2) 2-methylpropanoic acid
3) Tertiary bytyric acid
4) Butanoic acid
Ans: 2-methylpropanoic acid
CH3
CH3- CH- COOH
3
2
1
Parent chain contains 3 carbon atoms. The molecule is propanioc acid. –CH3
substituent is present on second carbon atom.
49
The IUPAC name of the compound
O
H3C-C-CH2-CH2-OH is
1) 3-oxobutan-1-ol
2) 1-hydroxy butan-3-one
3) 4-hydroxy butan-2-one
4) 2-oxobutan-4-ol
Ans: 3) 4-hydroxy butan-2-one
O
H 3C- C- CH2-CH2-OH
1
2
3
4
>C=O groups gets preference over the –OH. >C=O group is principle functional group.
–OH is substituent group and is named as hydroxy. Numbering is done from the left so
that the carbon atom of >C=O gets minimum number.
50
In Lassaigne’s test thiourea is converted into
1) NaCN
2) Na2S
3) Na2SO4
4) NaCNS
Ans: 4) NaCNS
Thiourea contains both N&S. When it is heated with sodium metal it is converted
in to NaCNS